Details of what character 51-year-old Clooney, 51, will play are still kept secret. The story centres on "a man who makes contact with aliens on Earth", reported Ace Showbiz.
The movie has tapped "Prometheus" writer Damon Lindelof and "Lost" co-creator Jeff Jensen. Lindelof will also serve as the producer.
As for Clooney, the Oscar-winning thespian has "The Monuments Men" as his next project. He will not only star in it, but also direct and co-write the script alongside Grant Heslove.
Clooney has tapped a number of high-profile stars, such as Daniel Craig, Jean Dujardin, Bill Murray and Cate Blanchett among others, as the cast members.
